Matthew R. Evans

TL;DR: It is argued that future work needs to examine the fitness effects of variation in immunocompetence and suggest that artificial selection experiments offer a potentially important tool for addressing this issue.

TL;DR: A meta-analysis found a significant suppressive effect of testosterone on immunity, in support of the hypothesis, but this effect disappeared when the authors controlled for multiple studies on the same species, and a funnel analysis indicated that the results were robust to a publication bias.

TL;DR: It is suggested that testosterone has a dual effect: it leads to immunosuppression through a mechanism involving corticosterone but, conversely, leads to increased immunocompetence probably via dominance influencing access to resources.

TL;DR: It is demonstrated that testosterone simultaneously affects both signal development and basal metabolic rate in the house sparrow (Passer domesticus), supporting a novel conclusion: that testosterone–dependent signals act as honest indicators of male quality possibly because only high–quality individuals can sustain the energetic costs associated with signal development.

TL;DR: It is argued here that viewing simple models as the main way to achieve generality may be an obstacle to the progress of ecological research, and how complex models can be both desirable and general.